We must conceive of this whole universe as one commonwealth of which both gods and men are members.

Astronomy compels the soul to look upwards and leads us from this world to another.

Everyone wants to share what he or she has learned with someone who really cares.

We are shaped by our thoughts; we become what we think. When the mind is pure, joy follows like a shadow that never leaves.

As far as we can discern, the sole purpose of human existence is to kindle a light in the darkness of mere being.